I hope you might have tried the following:
1. New browser
2. Incognito Window
3. Clear Cache and Cookies
If yes, it's time to try these:
- Login via the AEM System Console http://host:port/system/console/slingjsp
- Click on Recompile all JSPs
Alternatively,
- Log via CRXDE Lite
- Browse to /var/clientlibs
- Delete all contents under /var/clientlibs with the exception of rep:policy
- Click Save All.